O2 Oxygen Sensor Upstream Downstream for Hyundai Elantra (2017-2019) 2.0L

Direct-Fit O2 Sensor Kit for 2017-2019 Hyundai Elantra (AD)

What it Does: This matched upstream and downstream O2 sensor kit monitors pre- and post-catalyst exhaust lambda on the 2017-2019 Hyundai Elantra AD with the Nu 2.0L (G4NH) engine for accurate closed-loop fueling.

The Stock Hyundai Elantra O2 Sensor Failure

Factory oxygen sensors on the AD chassis with the Nu 2.0L (G4NH) engine endure severe exhaust heat cycling. Carbon fouling, coolant or oil contamination, and thermal shock degrade the zirconia element and burn out the internal heater circuit. As voltage switching slows, the ECU loses closed-loop lambda feedback and triggers fault codes including P0133, P0135, P0141, or P0171.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light / DTCs: Triggers P0133 (slow response), P0135/P0141 (heater circuit), or P2096 (lean post-cat trim).
• Rough Idle & Hesitation: Sluggish upstream switching destabilizes air-fuel ratios under light throttle.
• Poor Fuel Economy & Emissions Failure: Open-loop enrichment wastes fuel and fails OBD-II readiness checks.

The Direct-Fit Heated O2 Sensor Solution

Replacing both sensors as a matched set restores synchronous air-fuel metering and catalyst monitoring on the Nu 2.0L (G4NH) exhaust system. Each direct-fit unit uses a stainless steel shell, heat-shielded harness, and OEM-style connector that plugs straight into the chassis loom with zero splicing. Fast-acting zirconia elements shorten warm-up time, stabilize fuel trims, and restore factory ECU calibration.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2017-2019 Hyundai Elantra 2.0L (1 Upstream, 1 Downstream)
• Excluded: 1.4L/1.6L turbo engines; 2020 model year, Elantra GT, Veloster, and Kia Soul.

Frequently Asked Questions & Fitment Warnings

Does this fit the AD Elantra?

Yes. Direct fit for the 2017-2019 Hyundai Elantra Nu 2.0L (G4NH). Excludes 1.4L/1.6L turbo, 2020 models, Elantra GT, Veloster, and Kia Soul.

Will this clear P0135, P0141, or P2096 codes?

Yes, if sensor failure is the root cause. Replaces worn heaters and elements triggering P0133, P0135, P0141, or P2096 on the AD chassis.

Are connectors pre-installed for plug-and-play installation?

Yes, OEM connectors are pre-wired. Apply light anti-seize to threads only, avoiding the sensing tip, and torque to factory spec.

The Hyundai Precision Standard

Built for closed-loop ECU accuracy and thermal durability, this matched kit keeps your AD Elantra emissions-compliant and CEL-free.